Final answer:
Walter Mischel's work illustrated the person-situation debate in personality psychology, demonstrating that behavior is inconsistent across different situations but more consistent within the same situation.
Step-by-step explanation:
Walter Mischel's work illustrated the person-situation debate in personality psychology. He found that a person's behavior is inconsistent across different situations but more consistent within the same situation. Mischel's famous 'marshmallow test' also showed that behavior is consistent in equivalent situations across time.